I noticed a pretty big difference. I had a k&n drop in and switched to a afe stage 2si cai. Truck sounds better, better throttle response, seems to not feel as sluggish taking off from a dead stop. Butt dyno tells me I gained some hp? Not sure how much though if any? Hope that helps!

You're gonna have a split crowd here... Some people swear that stock we have a pretty good cai in which case a drop in is money. Personally, I have the TRD cold air and I love it to death! If you want to save money, get a drop in. If you want sound and a litle more performance, go for the full cold air.

Not really. It is supposed to but I don't believe they seal all that well.

TRD or AFE is the way to go although I don't like the AFE as much as the TRD since the AFE has an opening in the bottom of the box and hot air can get into there. Either way you won't see much of a gain with just an intake.

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+ 1 on this...

I had AIRRAID, same like K&N, sort of/ had XDI True flow; a little bit more protection from heat/ and now I have Volant Ram Air Intake.

I should of went with TRD to begin with. The others were so so.. XDI sound was growling, but not TCAI... Did not want to fab up for the URD... So went with Volant and without a special tune it screws up my AFR... TRD is the way to go, AFE SI is the same with a proven additional port that increases volume of air flow or better said the way the air enters the intake tubing. I am opting for AFE to run with my SC here come Aug. I will be giving up my Volant with Scoop for a sweet deal but cant ship til late july, so just keep in touch.

^^^ the 05-09 trd intake will fit the 2010's, but trd just redesigned the intake for 2010. Basically AFE isn't making them for trd anymore. I think another company is making them now? Can't remember who it is though? So far I've heard the one made by afe(05-09models) give more hp?